Solutions by everydaycalculation.com
1st number: 4/21, 2nd number: 1 9/21
421 + 3021 is 3421.
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Related: 8/21+30/21 4/21+60/21 4/42+30/21 4/21+30/42 12/21+30/21 4/21+90/21 4/63+30/21 4/21+30/63 20/21+30/21 28/21+30/21
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